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Rev | Author | Line No. | Line |
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422 | giacomo | 1 | #ifndef _LINUX_MMAN_H |
2 | #define _LINUX_MMAN_H |
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3 | |||
4 | #include <linux/config.h> |
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5 | #include <linux/mm.h> |
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6 | |||
7 | #include <asm/atomic.h> |
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8 | #include <asm/mman.h> |
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9 | |||
10 | #define MREMAP_MAYMOVE 1 |
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11 | #define MREMAP_FIXED 2 |
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12 | |||
13 | extern int sysctl_overcommit_memory; |
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14 | extern int sysctl_overcommit_ratio; |
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15 | extern atomic_t vm_committed_space; |
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16 | |||
17 | #ifdef CONFIG_SMP |
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18 | extern void vm_acct_memory(long pages); |
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19 | #else |
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20 | static inline void vm_acct_memory(long pages) |
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21 | { |
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22 | atomic_add(pages, &vm_committed_space); |
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23 | } |
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24 | #endif |
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25 | |||
26 | static inline void vm_unacct_memory(long pages) |
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27 | { |
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28 | vm_acct_memory(-pages); |
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29 | } |
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30 | |||
31 | /* |
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32 | * Optimisation macro. It is equivalent to: |
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33 | * (x & bit1) ? bit2 : 0 |
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34 | * but this version is faster. |
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35 | * ("bit1" and "bit2" must be single bits) |
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36 | */ |
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37 | #define _calc_vm_trans(x, bit1, bit2) \ |
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38 | ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ |
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39 | : ((x) & (bit1)) / ((bit1) / (bit2))) |
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40 | |||
41 | /* |
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42 | * Combine the mmap "prot" argument into "vm_flags" used internally. |
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43 | */ |
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44 | static inline unsigned long |
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45 | calc_vm_prot_bits(unsigned long prot) |
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46 | { |
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47 | return _calc_vm_trans(prot, PROT_READ, VM_READ ) | |
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48 | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | |
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49 | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC ); |
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50 | } |
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51 | |||
52 | /* |
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53 | * Combine the mmap "flags" argument into "vm_flags" used internally. |
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54 | */ |
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55 | static inline unsigned long |
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56 | calc_vm_flag_bits(unsigned long flags) |
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57 | { |
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58 | return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | |
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59 | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | |
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60 | _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) | |
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61 | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); |
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62 | } |
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63 | |||
64 | #endif /* _LINUX_MMAN_H */ |